- Black Currant is also known as Cassis. It is both a propagated and wild grown berry which some claim originated in France. Cassis is a very popular beverage throughout Europe, known for being aromatic in smell and in taste. This particular aspect of Black Currant is very evident on this tea. On a hot summer day, Black Currant quenches one's thirst very well. - We thoroughly scrutinize our decaffeinated teas to ensure that they stand up to North American Quality specifications. All of our decaffs